Macro impl_deserialize_num

macro_rules! impl_deserialize_num {
    ($primitive:ident, $nonzero:ident, $deserialize:ident $($method:ident!($($val:ident : $visit:ident)*);)*) => { ... };
    ($primitive:ident, $deserialize:ident $($method:ident!($($val:ident : $visit:ident)*);)*) => { ... };
}